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All the 3/4 tons that year came with Dana 44 "Heavy Duty" front axles that used those big hubs like in the above picture like you mentioned. That is not a picture of mine. They are getting very desirable and hard to come by. I would love to have a set of them. The previous owner replaced them with Selectro hubs :(
The "power assist" power steering sucks. LOL Like you said they are prone to leaking.
There were only two engine options in those trucks, a 300 6-cyl and the 360 V-8.
Your choice of trans, C-6 auto or the NP435 4 speed.
And they only came with 4:10 gears. There were no other options for the gears.
Its a fun old truck and I'm enjoying it. It still needs a ton of work.